JP2964110B2 - Flat motor stator structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator structure of a flat motor, and more particularly to a flat motor stator structure which has a simple structure, insulates an armature coil, and is extremely easy to assemble.

[0002]

2. Description of the Related Art In recent years, electronic devices such as tape recorders and electronic copying machines have been trending toward miniaturization and weight reduction for reasons such as user demand and improvement of performance. Along with this, the motors used in these electronic devices have been reduced in size and formed in a thin shape.

[0003]

One of the problems when the motor is miniaturized and flattened is the problem of insulation of the armature coil wound on the stator. That is, the armature coil is wound around the magnetic pole of the stator, and during this winding, the insulating film covering the conductor of the armature coil comes into strong contact with the magnetic pole and breaks, or the armature coil is wound. A bobbin is provided on the magnetic pole so that the insulation between the magnetic pole is not broken.
However, when the motor becomes smaller and flatter, the bobbin itself cannot be fitted into the magnetic pole, and a thick synthetic resin film is attached to the entire stator, or a tape is attached to the magnetic pole. There is a disadvantage that the volume to be wound is reduced and the armature coil cannot be wound more.

[0004] As another problem, there is a terminal treatment of the wound armature coil. Usually, a varnish, a wax or the like is applied or adhered on the wound armature coil so that the armature coil wound on the magnetic pole is not loosened, and the armature coil is temporarily fixed. Therefore, when the armature coil terminal is entangled with something during assembly and receives a pulling force, the winding terminal separates from the armature coil,
The varnish or the sealing wax is often peeled off and the armature coil wound at an angle is unwound during the manufacturing process of the motor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent a wound coil from being loosened during assembly of a small motor and to assemble the motor. Provide a flat motor stator structure that ensures sufficient insulation between the armature coil and the magnetic poles in the assembled state, uses as many ampere turns of the armature coil as possible, and makes assembly easier than before. It is assumed that.

[0006]

In order to achieve the above-mentioned object of the present invention, according to the first aspect of the present invention, a plurality of magnetic poles are projected from a ring-shaped yoke member in a radial direction.
In a flat motor stator structure in which an armature coil is wound around the magnetic pole, a shape in which a magnetic pole formed in a ring shape and having the same plane as the front and back surfaces is provided in the radial direction from the outer periphery of a flat yoke member having front and back surfaces parallel and flat And a portion covering the back surface of the stator core at least at a magnetic pole portion and a coupling ring portion (141) which is a connection portion between the stator core and the magnetic pole of the yoke member. A first insulator plate whose circumferential width is larger than the circumferential width of the magnetic pole, and a bond that is attached to the entire surface of the stator core and that is a connection portion between at least the magnetic pole portion and the magnetic pole of the yoke member. Ring part (14
The circumferential width of the portion covering the surface of the stator core of 1) is larger than the circumferential width of the magnetic pole, and
41) and the pole piece portion of the stator core (11)
In addition, the thickness of the other portion is greater than that of the other portions, and the reverse tapered cylindrical pin (15) having a large diameter at the tip portion is provided in each groove between the coupling ring portions (141) formed by the difference in the thickness. And a second covering the surface of a stator core integrally provided with the same material.
And an armature coil wound around a magnetic pole of a stator core having the first and second insulator plates adhered to the front and back surfaces, respectively. I do. Claim 2 of the present application
In the invention according to the first aspect, in addition to the invention according to the first aspect, the pin has a thickness sufficient to be inserted into a positioning hole provided in the motor board, and also serves as a positioning member for the stator with respect to the motor board. A flat motor stator structure is provided.

[0007]

Since two insulator plates are adhered to the front and back surfaces of the stator core, and the width of the magnetic pole is smaller than the width of the insulator plate, the armature coil wound around the magnetic pole does not contact the magnetic pole. Further, if the terminal of the armature coil is entangled with the pin set up on the second insulator plate, the armature coil will not be loosened even if a tensile force is applied to the terminal in the longitudinal direction.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of an outer rotor type flat motor according to the present invention. In FIG. 1, reference numeral 1 denotes a motor board composed of a printed wiring board. A support shaft 2 is provided upright at the center of the motor board 1. An outer rotor 5 is connected to the bearing shaft 2 via two bearings 3 and 4.
Is rotatably mounted. The outer rotor 5 has a shape such that a thin flat plate is turned upside down, and a bearing column 6 is erected in the center. The bearings 3 and 4 described above are arranged inside the bearing post 6. A ring-shaped field magnet 8 made of ferrite is provided inside the outer peripheral wall 7 of the outer rotor 5. A stator core 12 is provided inside the outer rotor 5 with a ring-shaped yoke member 9 inside and a plurality of magnetic poles 10 protruding radially from the outer periphery and having pole pieces 11 at the outer ends. An armature coil 13 is wound around the magnetic pole 10. The detailed structure of the stator core 12 including the armature coil 13 will be described later. An electronic component 14 for driving a motor is arranged in a space between the yoke member 9 of the stator core 12 and the bearing 6.

FIG. 2 is an exploded perspective view in which the flat motor according to the present invention is turned upside down and disassembled. As is apparent from FIG. 2, the field magnet 8 of the outer rotor 5 has N and S poles alternately magnetized in the circumferential direction. The motor board 1 is provided with a small hole 16 through which a pin 15 (for positioning and mounting the stator core 12) provided on the stator 12 is inserted. The small holes 16 are for positioning the stator 12 and for attaching the stator core 12. To assemble the flat motor, the pins 15 of the stator core 12 where the armature coils 13 have been wound are inserted into the small holes 16 of the motor board 1 on which the electronic components have been assembled, and the heads of the pins 15 are bonded with an adhesive. Melted by heat and stator 12
Is fixed to the motor board 1, and wiring work such as connecting the ends of the armature coils 13 to the terminals provided on the motor board 1 is performed. Next, the bearing shaft 2 is attached to the bearing column 6 of the outer rotor 5.
, And the C-ring 100 (FIG. 1) is fitted to the tip of the support shaft 2 to complete the assembly of the motor.

FIG. 3 is an exploded perspective view of the stator core 12. FIG. In FIG. 3, the stator core 12 is made of a ferromagnetic material such as ferrite, and may be made of a laminated body of silicon steel sheets in some cases. At the center of the stator core 12, a ring-shaped yoke member 9 having a flat front and back surface and being parallel is provided, and a plurality of magnetic poles 10 are provided so as to project radially from the outer periphery of the yoke member 9.
The pole piece 11 is provided at the tip of the. The magnetic pole 10 and the pole piece 11 have the same thickness as the yoke member 9 and have flat front and back surfaces following the yoke member 9. The front and back surfaces of the magnetic pole 10 and the pole piece 11 are parallel surfaces similar to the yoke member 9. 130 is the first
, Which is made of a thin polyamide resin plate and has almost the same shape as the stator core 12. However, the circumferential width W of the portion riding on the magnetic pole 10 is larger than the width S of the magnetic pole 10 in the same direction. Is also widely formed. 14
Numeral 0 denotes a second insulator plate, which is made of a thin polyamide resin plate like the first insulator plate 130, has substantially the same shape as the stator core 12, and has a circumferential width of a portion riding on the magnetic pole 10. W is formed wider than the width S of the magnetic pole 10 in the same direction. A groove 142 is formed on the coupling link 141 of the second insulator plate 140.
Is provided. The groove 142 is formed between the magnetic pole 10 and the magnetic pole 1.
It is located in the middle of 0. In the groove 142, the pin 15
Are formed integrally with the coupling link portion 141. First insulator plate 130 and second insulator plate 14
No. 0 is closely bonded to the upper and lower surfaces of the stator core 12 by a method such as thermocompression bonding. FIG. 4 is a perspective view of the assembled stator core 12.

FIG. 5 is a partial perspective view showing a state in which an armature coil 13 is wound around a magnetic pole 10 of a stator core 12.
Although not shown in the drawing, when the conductor is wound around the magnetic pole 10, the edge of the insulator plate is folded toward the magnetic pole 10 by the winding force of the conductor. For this reason, it is possible to increase the winding volume of the conductive wire while considering the dielectric strength. The winding end 161 of the armature coil 13 is
It is wound and entangled. Therefore, even if the winding end 161 of the armature coil 13 is pulled in the longitudinal direction, the coil will not be loosened. The pin 15 may have a columnar shape having the same thickness from the root to the tip. However, the pin 15 is used for positioning the stator 12 with respect to the motor board 1 as described above, and is inserted into the small hole 16 of the motor board 1. Therefore, if the winding end 161 of the armature coil 13 is wound around the leading end of the pin 15, there is a high risk that the winding end 161 of the wound coil will be cut during assembly.
In order to prevent such an accident beforehand, as clearly shown in FIG. 5, the pin 15 is provided with a reverse taper so that when the coil winding end 161 is wound around the pin 15, the wire is It is good to constitute so that it may gather at the base of the. Further, as shown in FIG. 6, the pin 15 has a cylindrical shape at the positioning portion, and may have a reverse taper at the lower part of the center where the winding end 161 of the coil is wound. . Although the above embodiment is a flat motor having four magnetic poles, the present invention is not limited to a flat motor having four poles, and is applicable to a flat motor having more or less poles. What we can do is not to wait.

[0012]

As described in detail above, the present invention provides
When two insulator plates are attached to the front and back surfaces of the stator core, the width of the magnetic pole is narrower than the width of these insulator plates. Therefore, when the armature coil is wound around the magnetic pole, the armature coil wound around the magnetic pole is used. Does not come into contact with the magnetic poles, the insulation interval between the armature coils and the magnetic poles can be sufficiently secured, and the coating covering the surface of the conductive wire of the coil does not break during the winding operation of the armature coil. Also, since the terminal of the armature coil can be entangled with the pin erected on the second insulator plate in the process of manufacturing the motor, the armature coil is not loosened even if a tensile force is applied to the coil terminal in the longitudinal direction. Absent. Therefore, the assembling of the motor is easier than the conventional one. In addition, when the pin has a reverse taper and is wound around the coil end pin,
When the stator is built into the motor board, even if the pin is inserted into the small hole of the motor board, the winding end of the wound coil may be cut because the wires are configured to gather at the root of the pin. Never.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flat motor according to the present invention.

FIG. 2 is an exploded perspective view of the flat motor according to the present invention.

FIG. 3 is an exploded perspective view of a stator core according to the present invention.

FIG. 4 is a perspective view of a stator core according to the present invention.

FIG. 5 is a partial perspective view of a stator core according to the present invention.

FIG. 6 is a partial side view showing another embodiment of the pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor board 2 ... Bearing shaft 3 ... Bearing 4 ... Bearing 5 ... Outer rotor 6 ... Shaft bearing column 7 ... Outer peripheral wall 8 ... Field magnet 9 ... -Yoke member 10-Magnetic pole 11-Pole piece 12-Stator core 13-Armature coil 14-Electronic component 15-Pin 16-Small hole 100-C ring 130 ··························································································

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-251060 (JP, A) JP-A-1-173743 (JP, A) Fully open 60-6080 (JP, U) Fully open Showa 56- 4342 (JP, U) Japanese Utility Model 2-17948 (JP, U) Japanese Utility Model 2-35423 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 3/30-3 / 52 H02K 1/00-1/34

Claims (2)

(57) [Claims] A stator structure of a flat motor in which a plurality of magnetic poles are projected from a ring-shaped yoke member in a radial direction and an armature coil is wound around the magnetic poles, wherein the front and back surfaces are formed in a ring shape and are parallel and flat. A stator core made of a ferromagnetic material having a shape in which a magnetic pole having the same plane as the front and back surfaces is provided in the radial direction from the outer periphery of the yoke member; A first insulator plate in which a circumferential width of a portion covering a back surface of the stator core in a coupling ring portion (141) which is a connecting portion with the first stator core is larger than a circumferential width of the magnetic pole; The circumferential width of at least the magnetic pole portion and the portion of the coupling ring portion (141), which is the connection portion with the magnetic pole of the yoke member, that covers the surface of the stator core is The thickness of the coupling ring portion (141) and the pole piece portion (11) of the stator core is greater than the other portions, and the coupling formed by the difference in plate thickness is larger than the circumferential width of the pole. A second insulator plate covering a surface of a stator core in which a reversely tapered cylindrical pin (15) having a large diameter at a tip end is integrally formed of the same material in each groove between the ring portions (141); A stator structure for a flat motor, comprising: an armature coil wound around magnetic poles of a stator core having first and second insulator plates adhered to the front and back surfaces. 2. The apparatus according to claim 1, wherein said pin has a thickness sufficient to be inserted into a positioning hole provided in the motor board, and also serves as a positioning member of the stator with respect to the motor board. Flat motor stator structure.